The ressie # that I received from my AAA TA did not look like a Disney # either. And right when the new 90+10 ADR policy came out was a couple days before my 90 day mark. So I emailed my TA and asked her for the Disney ressie # and was told "That is the only reservation # that Disney gave us"...which to me made it sound like it was a Disney #. But sure enough, on my 90 day mark, I called WDW Dine and told them the # that I had from AAA and specifically told them it was a AAA number and they were fine with it and I made my ADR's. I don't know that it clears anything up, but it was very odd to me that my TA said Disney gave her the #...which leads me to believe it is in Disney's system. I am guessing that the reason that it doesn't work on Disney's website is that they want you to do everything through AAA (except ADR's of course).